HVAC DIRECT SC-24-AH Stealth Ducted Unitary Air Handler Owner’s Manual

HVAC DIRECT SC-24-AH Stealth Ducted Unitary Air Handler

Product Information

The Stealth Ducted Unitary Air Handler is a high-quality air handling unit designed for residential and commercial use. It is available in four different models: SC-24-AH, SC-36-AH, SC-48-AH,and SC-60-AH. This air handler is manufactured by Stealth Comfort, a trusted brand known for its reliable and efficient products.

Key Features

• High-performance air handling unit
• Ducted installation
• Designed for both residential and commercial use
• Available in four different models
• Anti-corrosive and anti-explosion functions for special environments
• Complies with safety regulations and standards

Product Usage Instructions

Before installing and using the Stealth Ducted Unitary Air Handler, please read and follow the instructions provided in this manual.

Safety Precautions

1. This product should not be installed in corrosive, inflammable, or explosive environments, or in places with special requirements such as kitchens. Failure to comply may result in the unit malfunctioning, shortened service life, fire hazard, or serious injury. For special places, use an air conditioner with an anti-corrosive or anti-explosion function.
2. Pay attention to the safety signal words used in the manual: DANGER, WARNING, CAUTION, and NOTICE. These words indicate the level of potential risk associated with certain situations.
   • DANGER : Indicates a hazardous situation that may result in death or serious injury.
   • WARNING : Indicates a hazardous situation that could result in death or serious injury.
   • CAUTION : Indicates a hazardous situation that may result in minor or moderate injury.
   • NOTICE E : Indicates important but non-hazardous information related to property damage.

Electrical Safety Failure  to follow electrical safety precautions may result in personal injury or death. Before installing, modifying, or servicing the system, ensure that the main electrical disconnect switch is in the OFF position. If there are multiple disconnect switches, all of them should be locked out and tagged with a suitable warning label.

Disposal of Product
Dispose of the product responsibly in accordance with local, state, and federal guidelines. The equipment contains refrigerant chemicals that should not be discharged into the atmosphere.

Additional Instructions
The user manual also provides information on seasonal use, maintenance, parts replacement, and after-sales service. Please refer to the relevant sections in the manual for detailed instructions on these topics.

To Users
Thank you for selecting Stealth Comfort products. Please read this installation manual carefully before installing and using this product.

1. Not for use by children under 8 years old without supervision.
2. In general, it is recommended to leave power connected during stand-by status. If you power off for longer periods of disuse, energize and preheat the unit before resuming use.
3. This product is designed for residential use. Using for other purposes, such as commercial use may impact performance.
4. This product can’t be installed in corrosive, inflammable or explosive environments.
5. If the product needs to be installed, moved or maintained, we recommend using a qualified professional. Users should not disassemble or maintain the unit by themselves.
6. All the illustrations and information in the instruction manual are only for reference. Due to continuous improvement, you may see some small differences in your actual product. If you find inaccuracies in this manual, please contact your selling dealer or professional installer.

Exception Clauses
The manufacturer will bear no responsibilities when personal injury or property loss is caused by the following reasons:

1. Damage the product due to improper use or misuse of the product.
2.  Alter, change, maintain or use the product with other equipment without abiding by the instruction manual of the manufacturer.
3. After verification, the defect of the product is directly caused by corrosive gas.
4. After verification, defects are due to improper operation during the transportation of the product.
5. Operate, repair, and maintain the unit without abiding by the instruction manual or related regulations.
6. After verification, the problem or dispute is caused by the quality specification or performance of parts and components that are produced by other manufacturers.
7. The damage is caused by natural calamities, bad use of the environment or force majeure.

Please dispose of the product responsibly and in adherence to all local, state, and federal guidelines. This equipment contains refrigerant chemicals that should not be discharged into the atmosphere.

Safety Precautions

This product can’t be installed at corrosive, inflammable or explosive environment or a place with special requirements, such as the kitchen. Otherwise, it will affect the normal operation or shorten the service life of the unit, or even cause fire hazards or serious injury. As for the above special places, please adopt a special air conditioner with an anti-corrosive or anti-explosion function. Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions that may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing. Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use a quenching cloth for brazing operations. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in the literature and attached to the unit. Consult local building codes and the National Electrical Code (NEC) for special requirements. Recognize safety information. This is the safety–alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, CAUTION and NOTICE. These words are used with the safety–alert symbol.

• DANGER Indicates a hazardous situation that, if not avoided, will result in death or serious injury.
• WARNING Indicates a hazardous situation that, if not avoided, could result in death or serious injury.
• CAUTION Indicates a hazardous situation that, if not avoided, may result in minor or moderate injury.
• NOTICE Indicates important but not hazard-related information, used to indicate risk of property damage.

Electrical shock hazard:

• Failure to follow this warning could result in personal injury or death.
• Before installing, modifying, or servicing the system, the main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag the switch with a suitable warning label.

Product Introduction

Product Description
The Stealth air handler offers the perfect combination of superior product quality, operating efficiency, operating sound levels and value for money. The condensing unit uses the environmentally friendly refrigerant R410A, which is chlorine-free to help prevent damage to the ozone layer.

Optional Accessories

Indoor unit accessories|
---|---
No.| Name| Appearance| Q’ty| Usage|

1

| Adaptor

pipe

| | |

1

| To allow for brazing to the liquid pipe|
| |
|

2

| Adaptor

pipe

| |

1

| To allow for brazing to the

gas pipe

|
| | | | |
| | | |
|
| |
|

Physical Dimension

Model

| Dimension
---|---
W| D| H| A| B
SC-24-AH SC-36-AH| 21-1/4″| 21-1/4″| 48-1/4″| 11-5/8″| 20″
SC-48-AH SC-60-AH| 24-3/4″| 21-1/4″| 57″| 11-5/8″| 20″

Names of Main Partsm

General Information

Model

| Motor @ 230V ~, 60Hz
---|---
HP| FLA
SC-24-AH SC-36-AH| 1/2| 2.1
SC-48-AH

SC-60-AH

| 1| 3.2
Model| Filter size
---|---
SC-24-AH SC-36-AH| 20×20×1
SC-48-AH SC-60-AH| 21×20×1

NOTES:

1. Based upon W/nominal tonnage, dry coil and filter should be installed.
2. Use 0.96 as the approximate SCFM correction factor for the wet coil.

Dip switch configuration

• Set the indoor fan speed through the eight dip switches of the indoor main control board. The higher the level, the higher the speed of the indoor unit fan. Operation Instruction is below:
• Dip switch settings must be completed before powering on the unit.
• After the unit is shut down or stopped at the temperature point, the indoor unit will be delayed for a few minutes and then shut down. The extra time allows for additional drying of the coil to prevent mold accumulation during cooling, and extra efficiency during heating.
• During installation and debugging, check whether the thermostat has a fan delay and shutdown time setting. If the thermostat setting has been made, the air handler delay will be equal to the thermostat setting time plus the fan delay time of the indoor unit.

SC-24-AH

| Level 1| 1| 0| 0| 0| 0| 0| 0| 0
Level 2| 1| 0| 0| 1| 0| 0| 0| 0
Level 3| 1| 0| 1| 0| 0| 0| 0| 0
Level 4-Default| 1| 0| 1| 1| 0| 0| 0| 0
Level 5| 1| 1| 0| 0| 0| 0| 0| 0
Level 6| 1| 1| 0| 1| 0| 0| 0| 0
Level 7| 1| 1| 1| 0| 0| 0| 0| 0
Level 8| 1| 1| 1| 1| 0| 0| 0| 0

SC-36-AH

| Level 1| 0| 0| 0| 0| 0| 0| 0| 0
Level 2| 0| 0| 0| 1| 0| 0| 0| 0
Level 3| 0| 0| 1| 0| 0| 0| 0| 0
Level 4-Default| 0| 0| 1| 1| 0| 0| 0| 0
Level 5| 0| 1| 0| 0| 0| 0| 0| 0
Level 6| 0| 1| 0| 1| 0| 0| 0| 0
Level 7| 0| 1| 1| 0| 0| 0| 0| 0
Level 8| 0| 1| 1| 1| 0| 0| 0| 0
Model| Level| Heat (SA2)| Cool (SA1)
---|---|---|---

SC-48-AH

| Level 1| 1| 0| 0| 0| 0| 0| 0| 0
Level 2| 1| 0| 0| 1| 0| 0| 0| 0
Level 3| 1| 0| 1| 0| 0| 0| 0| 0
Level 4-Default| 1| 0| 1| 1| 0| 0| 0| 0
Level 5| 1| 1| 0| 0| 0| 0| 0| 0
Level 6| 1| 1| 0| 1| 0| 0| 0| 0
Level 7| 1| 1| 1| 0| 0| 0| 0| 0
Level 8| 1| 1| 1| 1| 0| 0| 0| 0

SC-60-AH

| Level 1| 0| 0| 0| 0| 0| 0| 0| 0
Level 2| 0| 0| 0| 1| 0| 0| 0| 0
Level 3| 0| 0| 1| 0| 0| 0| 0| 0
Level 4-Default| 0| 0| 1| 1| 0| 0| 0| 0
Level 5| 0| 1| 0| 0| 0| 0| 0| 0
Level 6| 0| 1| 0| 1| 0| 0| 0| 0
Level 7| 0| 1| 1| 0| 0| 0| 0| 0
Level 8| 0| 1| 1| 1| 0| 0| 0| 0

NOTE : 0 means dip switch to ‘on’, 1 means dip switch to number.

Fan Performance Data

Level

| Static pressure(Inches W.C.)
0| 0.1| 0.15| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8| 0.9| 1.0
Speed 1(CFM)| 1150| 1050| 950| 880| –| –| –| –| –| –| –| –
Speed 2(CFM)| 1200| 1100| 1000| 940| 850| –| –| –| –| –| –| –
Speed 3(CFM)| 1380| 1260| 1200| 1100| 950| –| –| –| –| –| –| –
Speed 4(CFM)| 1550| 1460| 1390| 1310| 1160| 1010| 830| –| –| –| –| –
Speed 5(CFM)| 1710| 1650| 1600| 1560| 1480| 1400| 1310| 1210| 1080| 930| –| –
Speed 6(CFM)| 1840| 1800| 1750| 1710| 1640| 1590| 1500| 1420| 1330| 1220| 1100| 960
Speed 7(CFM)| 1870| 1830| 1810| 1800| 1760| 1690| 1620| 1520| 1440| 1350| 1250| 1150
Speed 8(CFM)| 1900| 1860| 1840| 1830| 1790| 1720| 1660| 1600| 1540| 1440| 1320| 1220
Model| SC-48-AH
---|---
Level| Static pressure(Inches W.C.)
0| 0.1| 0.15| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8| 0.9| 1.0
Speed 1(CFM)| 1640| 1500| 1450| 1350| –| –| –| –| –| –| –| –
Speed 2(CFM)| 1680| 1560| 1500| 1380| 1300| –| –| –| –| –| –| –
Speed 3(CFM)| 1810| 1690| 1620| 1550| 1380| –| –| –| –| –| –| –
Speed 4(CFM)| 1930| 1830| 1770| 1710| 1580| 1430| 1280| –| –| –| –| –
Speed 5(CFM)| 2200| 2110| 2040| 1980| 1860| 1720| 1620| 1490| 1380| –| –| –
Speed 6(CFM)| 2240| 2190| 2145| 2100| 2010| 1870| 1750| 1615| 1500| 1380| –| –
Speed 7(CFM)| 2280| 2240| 2200| 2180| 2130| 2080| 2000| 1880| 1750| 1600| 1420|
Speed 8(CFM)| 2300| 2260| 2220| 2190| 2140| 2090| 2040| 1980| 1930| 1800| 1700| 1550
Model| SC-60-AH
Level| Static pressure(Inches W.C.)
0| 0.1| 0.15| 0.2| 0.3| 0.4| 0.5| 0.6| 0.7| 0.8| 0.9| 1.0
Speed 1(CFM)| 1660| 1540| 1470| 1400| –| –| –| –| –| –| –| –
Speed 2(CFM)| 1850| 1720| 1650| 1600| 1400| –| –| –| –| –| –| –
Speed 3(CFM)| 1920| 1800| 1730| 1650| 1480| 1315| –| –| –| –| –| –
Speed 4(CFM)| 2110| 2000| 1950| 1860| 1760| 1640| 1490| 1325| –| –| –| –
Speed 5(CFM)| 2250| 2200| 2190| 2140| 2040| 1930| 1800| 1670| 1520| 1370| –| –
Speed 6(CFM)| 2260| 2220| 2200| 2170| 2090| 2010| 1910| 1760| 1650| 1550| 1430| 1380
Speed 7(CFM)| 2300| 2260| 2230| 2200| 2150| 2115| 2050| 1990| 1920| 1840| 1750| 1660
Speed 8(CFM)| 2320| 2280| 2250| 2230| 2190| 2140| 2080| 2040| 2000| 1950| 1920| 1890

NOTE : Please refer to the above table for fan speed selection, and ‘-’ is not allowed to be used.

Preparing for Installation

Pre-Installation Instructions
Checking Product Condition
After receiving the product, please check if there is any damage caused by transportation. Shipping damage is the responsibility of the carrier. Verify the model number, specifications, and accessories are correct prior to installation. Do not install transportation-damaged or mis-shipped equipment – contact your original dealer.

Before Installation
Carefully read all instructions for the installation prior to installing the product. Make sure each step or procedure is understood and any special considerations are taken into account before starting installation. Assemble all tools, hardware and supplies needed to complete the installation. Some items may need to be purchased locally. Make sure everything needed to install the product is on hand before starting.

Codes & Regulations
This product is designed and manufactured to comply with national codes. It is the installer’s responsibility to install the product in accordance with such codes and/or any prevailing local codes/regulations. The manufacturer assumes no responsibility for equipment installed in violation of codes or regulations.

Replacement Parts
When reporting shortages or damages, or ordering repair parts, give the complete product model and serial numbers as stamped on the product. Replacement parts for this product are available through your contractor or local distributor.

Important Safety Instructions
Recognize safety symbols, words, and labels
The following symbols and labels are used throughout this manual to indicate immediate or potential hazards. It is the owner’s responsibility to read and comply with all safety information and instructions accompanying these symbols. Failure to heed safety information increases the risk of serious personal injury or death, property damage, and/or product damage.

• DANGER Immediate hazards that will result in property damage, product damage, severe personal injury, or death.

• WARNING Hazards or unsafe practices could result in property damage, product damage, severe personal injury, or death.

• NOTICE Hazards or unsafe practices may result in property damage, product damage, severe personal injury, or death.

• WARNING Before serving or installing this equipment. The electrical power to this unit must be in the “off” position. Caution, more than one disconnect may exist. Failure to observe this warning may result in an electrical shock that can cause personal injury or death.

• WARNING The United States Environmental Protection Agency (“EPA”) has issued various regulations regarding the introduction and disposal of refrigerants introduced into this unit. Failure to follow these regulations may harm the environment and can lead to the imposition of substantial fines. These regulations may vary due to the passage of laws. A certified technician must perform the installation and service of this product. Should questions arise, contact your local EPA office.

• WARNING Due to high system pressure and electrical shock in potential, installation and service work can be dangerous. Only trained and qualified persons are permitted to install or service this equipment. Observe all warnings contained in this manual and labels/tags attached to the equipment.

• WARNING This product is factory shipped for use with a 208/230V-1Ph-60Hz electrical power supply. This air handler must not be reconfigured to operate with any other power supply.

• WARNING The unit must have an uninterrupted, unbroken electric grounding to minimize the possibility of personal injury if an electric fault occurs. The electric grounding circuit may consist of an appropriate-sized power cord connected with the grounding piece located in the unit control box and also connecting to the building’s electric service panel. Other methods of grounding are permitted if performed in accordance with the “National Electric Code” (NEC)/ “American National Standards Institute” (ANSI)/ “National Fire  Protection Association” (NFPA) 70 and local/state codes. In Canada, electric grounding conforms to the Canadian electric code CSA c22.1. Failure to observe this warning can result in electrical shock that can cause personal injury.

• Special warning for installation of furnaces or air handling units in enclosed areas, such as garages, utility rooms, or parking areas.

• Carbon monoxide-producing devices (such as an automobile, space heater, gas water heater, etc.) should not be operated in enclosed areas such as unventilated garages, utility rooms or parking areas because of the danger of carbon monoxide (CO) poisoning resulting from the exhaust emissions. If a furnace or air handler is installed in an enclosed area such as a garage, utility room, or parking area and a carbon monoxide-producing device is operated therein, there must be adequate ventilation directly to outside.

• This ventilation is necessary to avoid the danger of CO poisoning which can occur if a carbon monoxide-producing device continues to operate in the enclosed area. Carbon monoxide emission can be (re)circulated throughout the building if the furnace or air handler is operating in any mode. CO can cause serious illness including permanent brain damage or death.

Installation

Unit Inspection

• Upon delivery, inspect the unit for damage. Any damage must be reported immediately to the carrier. Do not install such equipment damaged by freight which determines the integrity and safety of the unit.
• Please check the equipment model number to ensure the unit is appropriately sized for the condensing unit.
• If an incorrect unit is supplied, it must not be installed and it is to be returned to the supplier. The manufacturer assumes no responsibility for the installation of incorrectly delivered units. The evaporator coil contains high-pressure inert gas for holding charge.

Location

WARNING
This air handler is designed for indoor installation only. Do not install it outdoors.

• When installing the air handler, take into consideration minimizing the length of refrigerant tubing as much as possible. Do not install the air handler in a location either above or below the condenser that violates the instructions provided with the condenser. Service clearance is to take precedence. Allow a minimum of 24” in front of the unit for service clearance. When installing in an area directly over a finished ceiling (such as an attic), an emergency drain pan is required directly under the unit. See local and state codes for requirements. When installing this unit in an area that may become wet, elevate the unit with a sturdy, non-porous material. In installations that may lead to physical damage (i.e. a garage), it is advised to install a protective barrier to prevent such damage.
• This air handler is designed for a complete supply and return ductwork system. Do not operate this product without all ductwork attached.
• If the air handler is installed as Fig. A, the air handler should be concealed in a specific room or space in a utility area.
• If the air handler is installed as Fig. B, make sure that there is enough space for care and maintenance and that the height between the air handler and the ground is above 8′ in a utility area.

Piping Work
Specification of Connection Pipe

Model

| External diameter (inch)
---|---
Gas pipe| Liquid pipe
SC-24-AH SC-36-AH SC-48-AH SC-60-AH|

Φ3/4″

|

Φ3/8″

Piping Preparation
Solder Connection
All cut ends are to be round, burr-free, and clean. Failure to follow this practice increases the chances for refrigerant leakage.

Screw Connection

Condensate Removal

1. It is not allowed to connect the condensate drain pipe to sewer pipe or other pipelines which are likely to produce corrosive gasses or unpleasant odors indoors.
2. It is not allowed to connect the condensate drain pipe to the rain pipe to prevent rainwater from pouring in and causing property loss or personal injury.
3. Condensate drain pipe should be connected to a dedicated drain system for the air conditioner.
4. The drain pan has primary and secondary drain connections. Condensate removal is performed by attaching a 3/4” PVC pipe to the evaporator coil pan and terminating in accordance with local or state Plumbing/HVAC codes. The installation must include a “P” style trap that is located close to the evaporator coil. Do not over-tighten the drain connection in order to prevent possible damage to the evaporator drain pan. See the following figure for details of a typical condensate line “P” trap.

Ductwork
This air handler is designed for a complete supply and return ductwork system.

• Do not operate the unit without all ductwork completed.
• Do not operate this product without all ductwork attached.
• Inadequate ductwork that restricts airflow can result in improper performance and compressor or heater failure. Ductwork is to be constructed in a manner that limits restrictions and maintains suitable air velocity. Ductwork should be sealed to the unit with tape and mastic to prevent leakage.
  Return ductwork: Do not terminate the return ductwork in an area that can introduce toxic or objectionable fumes/odors into the ductwork. The return ductwork is to be introduced into the air handler bottom (upflow configuration).
  Return Air Filters: Each installation must include a return air filter. This filtering may be performed at the air handler or externally such as a return air filter grille.

Electric Heater
The air handlers listed in this manual do not have factory-installed electric heat. Electric heat is available as an accessory. Please refer to the installation instructions provided with the heater kit for the correct installation procedure.

• Refer to the “Electric heater kits installation” section of this manual and the instructions provided with the heater kit for the correct installation procedure.
• The electrical characteristics of the air handler, the electric heater kit, and the supply power should be identical. This air handler does not have factory installed electric heater. Electric heater is available as an accessory. If installing this option, the only heater kits that can be used are the series as indicated below. It is forbidden to use the electric heater other than those recommended.
• Installation and debugging when attention to verify the switch sequence of electrical heating and fan, ensure the fan must be turned on when electric heating operation and ensure the electric heating is turned off before the fan to avoid unsafe.

Electric Heater Kits Available

Electric Heater Kits Installation

1. Ensure that all power supply is disconnected prior to installing the heater kit.
2. A means of strain relief and conductor protection must be provided at the supply wire entrance into the cabinet.
3. Use copper conductors only.
4. Installation must follow the national electric code and other applicable codes.
5. If this appliance is installed in an enclosed area such as a garage or utility room with any carbon monoxide-producing appliance, ensure the area is properly ventilated.
6. Refer to the Table for the appropriate heater kit.
7.  Check any physical damage, do not install a damaged heater kit.
8. Remove the upper access panel from the air handler.
9. Remove the cover plate from air handler.
10. Slide the heater kit into the slot and secure the element plate with previously removed screws.
11. Insert power leads into the circuit breaker lugs or stripped red and black wires (for heater kit without circuit breaker) and tighten.
12. Connect the ground wire to the ground lug.
13. Knock off the appropriate area of the plastic circuit breaker cover on the access panel of the air handler. Knock off the holes according to the actual installation number and positions of circuit breakers. If circuit breaker is not installed, do not knock off the holes; otherwise, an electric shock may occur.
14.  Replace the access panel and check operation.
15. Connection of power cords and thermostat wires.

**Electrical Installation

**

Requirement and Notice on Electrical Installation
The electrical installation for the air conditioner should follow these requirements:

1. The electrical installation must be conducted by professionals in compliance with local laws and regulations and the instructions in this manual. Never extend the power cords. The electric circuit must be equipped with a circuit breaker and air switch both with sufficient capacity.
2. The unit’s operating power must be within the nominal range stated in the instruction manual. Use a specialized power circuit for the air conditioner. Do not draw power from another power circuit.
3. The air conditioner circuit should be at least 5′ away from any inflammable surface.
4. The external power cords, the thermostat wires and the thermostat must be effectively fixed.
5. The external power cords, the thermostat wires and the thermostat can’t directly contact any hot objects. For example: they must not contact chimney pipes, warm gas pipes or other hot appliances.
6. The external power cords, the thermostat wires and the thermostat must not be squeezed. Never pull, stretch or bend the wires.
7. The external power cords, the thermostat wires and the thermostat must not contact metal beams or edges on the ceiling, or touch any metal burrs or sharp metal edges.
8. Connect wires correspondingly by referring to the circuit diagram labeled on the unit or electric box. Screws must be securely tightened.
9. Wiring terminals should be connected firmly to the terminal board. Loose connections are dangerous and to be avoided.
10. After the electrical installation is finished, please use wire clamps to secure all power wiring and the thermostat wires. Make sure the wires are not clamped too tight.

Electrical Parameters

Model

|

Power supply

| Minimum circuit ampacity (A)| Maximum overcurrent protection (A)
---|---|---|---
SC-24-AH| | 4|
SC-36-AH| 208/230V-1Ph-60Hz| 15
SC-48-AH| 8
SC-60-AH| |

1. The fuse is located on the main board.
2. Install a circuit breaker at every power terminal near the units (indoor unit and thermostat) with at least 3mm contact gap. The units must be able to be plugged or unplugged.
3. Circuit breaker and power cord specifications listed in the above table are determined based on the maximum power input of the units.
4. Specifications of power cords listed in the above table are applicable in a working condition where ambient temperature is 104°F and multi-core copper cable (e.g. YJV copper cable, with insulated PE and PVC sheath) is protected by a conduit, and is resistant to 194°F in maximum (see IEC 60364-5-52). If working condition changes, please adjust the specifications according to national standards.
5. Specifications of circuit breaker are based on a working condition where the working temperature is 104°R. If working condition changes, please adjust the specifications according to national standards.
6. Adopt 5pc of AWG18 power cords to be the communication cords between the indoor unit and the thermostat. The maximum length is 98′. Please select a proper length according to local conditions. Communication cords must not be twisted together.
7.  The wire gauge of the communication cord should not be less than AWG18. It’s recommended to use AWG18 wire as the communication cords.

Connection of Power Cords and Thermostat Wires

1. For solid wires (as shown below):

2. Use wire cutters to cut off the wire end and then peel away about 1″ of the insulation layer.

3. Use a screwdriver to unscrew the terminal screw on the terminal board.

4. Use nippers to bend the solid wire into a ring that fits the terminal screw.

5. Form a proper ring and then put it on the terminal board. Use a screwdriver to tighten up the terminal screw.

6. For strand wires (as shown below):

7. Use wire cutters to cut off the wire end and then peel away about 1/2″ of the insulation layer.

8. Use a screwdriver to unscrew the terminal screw on the terminal board.

9. Use a round terminal fastener or clamp to fix the round terminal firmly on the peeled wire end.

10. Locate the round terminal conduit. Use a screwdriver to replace it and tighten up the terminal screw (as shown below).

11. How to connect the thermostat wires and power cords.
    Feed the thermostat wires and power cords through the insulation tube. Then secure the wires with wire clamps (as shown in the following figure.)

12. Before working, please ensure the indoor unit and thermostat are powered off.

13. Match the terminal numbers and wire colors with the colors indicated in the indoor unit.

14.  Incorrect wiring connections may burn out the electrical components.

15. Connect the wires securely to the wiring box. Incomplete installation may lead to fire hazards.

16. Please use wire clamps to secure the external covers of connecting wires. (Insulators must be clamped securely; otherwise, electric shock may occur.)

17. The ground wire should be connected. Wires of indoor unit (Only for air handler without electric heater)

NOTE :

• Y means Compressor control signal for the outdoor unit;
• B which is energized under the heating mode means a 4-way valve control signal;
• D means defrosting signal;
• R means 24V AC power supply;
• C means 24V common;
• G means indoor unit fan signal for the indoor unit;
• W1 means heater control signal.
• NOTE : For cooling-only unit, there is no need to connect the B and D terminals.
• NOTE : When outdoor defrosts, D of the outdoor unit will send a 24V signal to avoid cold winds.
• NOTE : When the electric heating operates, the indoor unit fan is forced to open.

WARNING

1. High and low-voltage wires should be fed through different insulating rubber rings on the electric box cover.
2. Do not bundle up the thermostat wires or lay them side by side, otherwise, errors will occur.
3. High and low-voltage wires should be secured separately with the appropriately sized clamps.
4. Use screws to tighten up the thermostat wires and power cords of the unit on the terminal board. Poor connections may lead to fire hazards.
5. If the thermostat wires of the unit and power cords are poorly connected, the air conditioner may get damaged.
6. Ground the unit by connecting the ground wire.
7. The units should comply with applicable local and national rules and regulations on power consumption.
8. When connecting the high-voltage wiring, make sure the phase of the power supply matches with the corresponding terminals, otherwise, the compressor will be reversed causing damage and lack of operation.

Installation Check and Trial Run

Checking Items after Installation

or heating

performance or damage.

|
Check if the unit has been insulated properly.| It may cause unwanted

condensation.

|
Check if the water can be drained fluently.| It may cause unwanted condensation.|
Check if the power voltage agrees with that on the nameplate.| Malfunction or damage to equipment.|
Check if the wiring and pipe line has been installed correctly.| Malfunction or damage to equipment.|
Check if the unit has been earthed soundly.| Hazard of electric shock.|
Check if the wiring conforms to the wire gage.| Malfunction or damage to equipment.|
Check if there is obstruction blocking the air inlet/outlet.| It may cause poor cooling or heating performance or damage.|
Check if the piping length and refrigeration charging volume has been recorded.| To provide information for future servicing.|
Check if the piping connection and valves have been set properly.| Malfunction or damage to equipment.|
Make sure there is no crack among air return and supply pipe.| It may cause air leak, vibration and noise.|
Check if the panel is mounted firmly.| It may cause air leak, vibration and condensation.|

Trial Run
Preparation for Trial Run

1. Never power on the unit until all the installation work has been done.
2. All the thermostat and high-voltage wiring have been securely connected correctly. Valves on the gas and liquid line should be completely open.
3. Any scattered objects should be removed, such as tools and debris.
4. Check if the unit’s appearance and piping system have been damaged during transportation or handling.
5. Check if the terminals are loose and the phases are correct.

Trial Run

1. A trial run can be initiated by a professional installer only after the above items have been checked.
2. Power on the unit and press the ON/OFF button to activate.
3. After the compressor starts up, please immediately stop the unit if you hear sounds such as grinding, banging, loud whine or scraping.
4. Trial run under several modes and check if the unit operates normally.

Common Malfunction and Elimination

If the unit doesn’t run normally, please check the following items before asking for service.

The unit can not be activated.

| The unit doesn’t connect with power supply.| Connect with power supply.

Low voltage.

| Check if circuit voltage is within rated scope.
Fuse broken or breaker trips off.| Replace fuse or connect breaker.
The unit operates but stops immediately.| Air inlet/outlet of indoor unit is blocked.|

Remove obstacles.

Abnormal cooling or heating.

| Air inlet/outlet of indoor unit is blocked.| Remove obstacles.
Inappropriate temperature setting.| Adjust setting at thermostat.
Doors or windows are opened.| Close the door or windows.
Direct sunshine.| Draw curtain or louver.
Too much heat source in the room.| Reduce heat source.
Filter screen is blocked by dirt.| Clean the filter.

NOTE : If reasons are still unclear after checking above items, please contact Gree service center and show phenomena and models.
Following circumstances are not malfunction.

The unit doesn’t run.

| When unit is started immediately after it is just turned off.| The overload protection switch makes it run after 3 minute delay.
When power is turned on.| Standby operating for about 1 minute.
Mist comes from the unit.| Under cooling.| Indoor high-humidity air is cooled rapidly.

The unit emits noise.

| Slight cracking sound is heard when just turned on.| It is noise when the electronic expansion valve is initialized.
There is consecutive sound when cooling.| That’s sound for gas refrigerant flowing in the unit.
There is sound when unit starts or stops.| That’s sound for gas refrigerant stops flowing.
There is slight and consecutive sound when unit is running or after running.|

That’s sound for operation of drainage system.

The unit blows out dust.

| When unit runs after no operation for a long period.|

Dust in indoor unit is blew out.

The unit emits odor.| Operating.| The room odor absorbed by the unit is blew out again.

Indoor unit still runs after switch off.

|

After every indoor unit receive “stop” signal, fan will keep running.

| Indoor fan can be set as “ON” or “AUTO” mode. Under “ON” mode, indoor fan will keep running after switch off the unit.

There are LED indicators on the main board of the indoor unit, which are used to display the operating status and malfunction information of the unit.

on.

Running Indicator

|

Green

| After detecting the indoor fan turn-on signal, the running indicator light is on, when detecting the indoor fan turning-off signal, the running indicator light is off. When detecting a system failure, the

running indicator light flashes.

Different running indicator flashing light means different system failure.

Flash means light on 0.5S then light out 0.5S

Indoor fan failure| Light out 3S then flash twice
Indoor tube temperature sensor failure| Light out 3S then flash four times

Maintenance and Care

Regular checks, maintenance, and care should be performed by professional personnel, which will prolong the unit life span.

Drain Pipe
Regularly check if the drain pipe is clogged in order to drain condensate smoothly.

Notice before Seasonal Use

1. Check if the inlet/outlet of the indoor unit is clogged.
2. Check if the ground wire is grounded well.
3. Check if the filter screen has been seated snugly.
4. Check if the unit is installed firmly. If there is something abnormal, please contact the local appointed service center.

Maintenance after Seasonal Use

1. Cut off the main power supply of the unit.
2. Clean filter screen of indoor units.
3. Clean the dust off the indoor units.
4. In the event of rusting, use anti-rust paint to stop the spreading of rust.

Parts Replacement
Purchase parts from a locally appointed service center or dealer if necessary.

After-Sales Service

In case the air-conditioning unit you bought has any quality problems or you have any inquiries, please contact the local after-sales service agency designated by the factory.
Warranty should meet the following requirements:

1.  First run of the unit should be operated by professional personnel from factory appointed service center.
2. Only factory-manufactured accessories can be used on the machine.
3. All the instructions listed in this manual should be followed.
4. The warranty will be automatically invalid if fails to obey any item mentioned above.

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